cislunar

adjective

cis·​lu·​nar (ˌ)sis-ˈlü-nər 

: lying between the earth and the moon or the moon's orbit

cislunar space

Examples of cislunar in a Sentence

Recent Examples on the Web

If the United States does not invest in these technologies, Sonntag writes, its competitors will then be able to field them first and potentially control cislunar space. — Leonard David, Space.com, 28 May 2026

The company is also involved in the Air Force Research Lab’s Oracle-P program to build space situational awareness spacecraft in cislunar space. — Eric Berger, ArsTechnica, 7 May 2026

That's a transformation of cislunar economics, enabled precisely by pairing cheap launch with efficient in-space propulsion. — Fred Kennedy, Forbes.com, 17 Apr. 2026

As more spacecraft are slated to start populating this area thanks to private companies launching their own satellites and landers (more on that shortly), resolving how to remain safe in cislunar space is top of mind. — Monisha Ravisetti, Space.com, 7 Apr. 2026

But observing objects in cislunar space from the Earth is not easy. — Stephen Clark, ArsTechnica, 1 Apr. 2026

Blue Ring is designed to operate anywhere from low Earth and geostationary orbits to cislunar space, Mars and other deep-space destinations. — Josh Dinner, Space.com, 17 Mar. 2026

As such, researchers at the Lawrence Livermore National Laboratory (LLNL) in California have developed a new method for modeling orbits in cislunar space, which refers to the space between and around Earth and the moon. — Julian Dossett, Space.com, 10 Feb. 2026

Word History

First Known Use

circa 1877, in the meaning defined above

Rhymes for cislunar

• lacunar
• lunar
• schooner
• sooner
• spooner
• tuner
• semilunar

Kids Definition

cislunar

adjective

cis·​lu·​nar (ˈ)sis-ˈlü-nər 

: lying between the earth and the moon or the moon's orbit